Atopy is a predisposition toward developing certain allergic hypersensitivity reactions. Atopy may have a hereditary component, although contact with the allergen or irritant must occur before the hypersensitivity reaction can develop.
As of 2012, 63.9 percent of players playing in Major League Baseball are white. There is no way of telling the exact number due to the number of players.
It makes you wonder just how many balls get used in the course of a game... According to MLB, between five and six dozen are used per game (60-70 balls). The home team has to have 90 new baseballs on hand for each game. That doesn't mean they'll use them all, but they must have them, just in case.